CN101733377A - Continuous casting mold fluxes for medium-high carbon steel and alloy steel - Google Patents
Continuous casting mold fluxes for medium-high carbon steel and alloy steel Download PDFInfo
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- CN101733377A CN101733377A CN201010019535A CN201010019535A CN101733377A CN 101733377 A CN101733377 A CN 101733377A CN 201010019535 A CN201010019535 A CN 201010019535A CN 201010019535 A CN201010019535 A CN 201010019535A CN 101733377 A CN101733377 A CN 101733377A
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Abstract
The invention provides continuous casting mold fluxes specific for production of medium-high carbon steel and alloy steel. The mold fluxes are applicable to the production of the medium-high carbon steel and the alloy steel with a carbon content ranging from 0.26 to 1.0 weight percent by a thin slab continuous casting machine. The mold fluxes mainly comprise the following components in weight percentage: 23.0 to 31.0 percent of SiO2, 22.0 to 29.0 percent of CaO, 4.0 to 6.0 percent of MgO, 2.5 to 4.5 percent of Al2O3, less than or equal to 1.3 percent of Fe2O3, less than or equal to 1.0 percent of MnO2, 10.0 to 13.0 percent of Na2O, 8.7 to 12.0 percent of F and 7.0 to 10.0 percent of C. The mold fluxes of the invention have relatively low crystallization and softening temperatures, so when the medium-high carbon steel and the alloy steel with a relatively low liquidus temperature are poured, the lubrication of a non-Newtonian fluid and the probability of surface cracking caused by the inhomogeneous heat dissipation of a casting slab due to the crystallization are greatly reduced in a relatively low crystallization and softening temperature range.
Description
Technical field
The invention belongs to the continuous casting covering slag technical field, the continuous casting covering slag that particularly a kind of continuous casting and rolling technique of sheet bar production medium high carbon carbon steel and steel alloy are used.
Background technology
Continuous casting covering slag is that continuous casting of molten steel is produced one of most important auxiliary material.Along with the raising of domestic and international continuous casting ratio, its continuous casting covering slag has been tending towards standardization in industry.Usually contain CaO, SiO in the covering slag
2, Al
2O
3Deng the raw mineral materials of oxide, wherein CaO, SiO
2Account for 55～80%, CaO/SiO between 0.5～1.5, Al
2O
3Account between 2～15%; Add fusing point and the viscosity that the flux that contains elements such as Na, F is adjusted covering slag, Na again
2O+F accounts for 5～20% of covering slag total amount; Continuous casting covering slag all will be allocated the carbon materials of some into and control the burn-off rate of covering slag on crystallizer molten steel face, and other technological parameters of itself and continuous casting are complementary.
Thin-slab caster is compared with the conventional panels billet continuous casting machine, and have following characteristics: pulling rate is fast, and the consumption of covering slag reduces, and causes insufficient lubrication and conducts heat uneven; The crystallizer steel-passing amount is big, and place, mouth of a river molten steel flow velocity increases, the liquid fluctuating aggravation; Molten steel time of staying in crystallizer is short, and cooling velocity is fast, makes the liquid level temperature low, and causing slag is bad.Therefore two hang-ups that usually run into of sheet blank continuous casting, promptly adhesion bleed-out and cc billet surface quality are poor, need to use the continuous casting covering slag that is different from traditional sheet billet continuous casting.
Based on the sheet blank continuous casting technological process, patent 91108426.6 provides a kind of thin plate blanket continuous casting protective slag and manufacture method at present, is mainly used in the production of sheet blank continuous casting flow process middle low carbon steel.Ox Yongqing etc. 2009 CSP international symposium collection of thesis " development and the application of sheet blank continuous casting medium carbon steel covering slag " the medium carbon steel continuous casting covering slag of production phosphorus content 0.16～0.20% is reported its covering slag basicity is designed to 1.14～1.18.Medium high carbon steel series (phosphorus content 0.26～1.0%) particularly medium high carbon carbon steel, steel alloy (C is the privacy protection slag that 0.26～1.0Wt.%) continuous casting is produced, and yet there are no report and exploitation both at home and abroad.
The characteristics of medium high carbon scope steel grade are that setting rate is slow; Calorific intensity is poor, and crack sensitivity is big, is easy to generate face crack; The steel grade liquidus temperature is low, and pouring temperature and poring rate are lower; Simultaneously because the initial base shell solidification shrinkage that generates is easy to generate bonding steel leakage for a short time.Therefore, in the design for sheet blank continuous casting medium high carbon carbon steel and alloy steel continuous casting covering slag, should select to consider covering slag burn-off rate, reduce its viscosity and melting temperature and guarantee the good lubrication performance between the base shell and crystallizer wall in the crystallizer; Guarantee that the slag film thickness between crystallizer inwall and the base shell is suitable and even; Guarantee stable operating characteristics, can not cause the fluctuation of covering slag melt cinder physical parameter for the fluctuation of liquid steel temperature and composition.
Summary of the invention
The invention provides a kind of continuous casting covering slag, this covering slag is applicable to the high-quality medium high carbon carbon steel among the thin-slab caster production GB/T 699-1999: C is that 0.26～1.0Wt.%, Mn content are 0.35～1.2Wt.%; And the medium high carbon steel alloy (C is 0.26～1.0Wt.%).
Covering slag of the present invention is achieved by the following technical solution:
The continuous casting covering slag of a kind of medium high carbon carbon steel and steel alloy mainly is grouped into by following one-tenth: SiO
223.0～31.0wt%, CaO 22.0～29.0wt% (CaO+SiO
245.0～60.0wt%), MgO 4.0～6.0wt%, Al
2O
32.5～4.5wt%, Fe
2O
3≤ 1.3wt%, MnO
2≤ 1.0wt%, Na
2O 10.0～13.0wt%, F 8.7～12.0wt%, (Na
2O+F accounts for 18.7～25.0wt%) C, 7.0～10.0wt%, preferably, also includes K
2O≤1.5wt%, LiO
2Among≤the 1.0wt% one or both; More preferably, it mainly consists of: SiO
223～28wt%, CaO 23.0～27.0wt%, MgO 4.0～6.0wt%, Al
2O
32.5～4.5wt%, Fe
2O
3≤ 1.3wt%, MnO
2≤ 1.0wt%, Na
2O 11.0～13.0wt%, F 10.0～12.0wt%, C 7.0～10.0wt%.
Described medium high carbon carbon steel and alloy steel continuous casting covering slag, its physical and chemical index: the fusion point scope is 997 ± 50 ℃, and the basicity scope is 0.92 ± 0.1, and range of viscosities is 0.95 ± 0.5 (1300 ℃) pools, and the bulk density scope is 0.60 ± 0.2Kg/L.More preferably, described fusion point scope is 987 ± 40 ℃, and the basicity scope is 0.92 ± 0.05, and range of viscosities is 0.95 ± 0.5 (1300 ℃) pools, and the bulk density scope is 0.60 ± 0.2Kg/L.
The present invention has the following advantages:
(1) at the characteristics of thin-slab caster and the characteristics of medium high carbon carbon steel and steel alloy, broken through the mentality of designing of traditional process continuous casting covering slag, adopted the theory of eutectic melting point, low basicity, moderate viscosity and low bulk density.
(2) covering slag of the present invention is different from the continuous casting covering slag of traditional sheet billet continuous casting, has the characteristics of eutectic melting point, low basicity, moderate viscosity and low bulk density.Covering slag raw mineral materials CaO+SiO of the present invention
2Account for 45.0～60.0%, Al
2O
32.5～4.5%, than traditional process continuous casting covering slag low (traditional C aO, SiO
2Account for 55.0～80.0%); The high Na of flux content
2O+F accounts for 18.7～25.0%, than traditional process continuous casting covering slag height (traditional Na
2O+F account for the covering slag total amount 5.0～20.0%).The covering slag fusion point is low, and the basicity scope is 0.92 ± 0.1 low than sheet blank continuous casting medium carbon steel covering slag basicity (1.14～1.18), and range of viscosities is 0.95 ± 0.5 (1300 ℃) pools, and the bulk density scope is 0.60 ± 0.2Kg/L.
(3) realized the stable smooth operation of sheet blank continuous casting medium high carbon carbon steel and steel alloy molten steel sequence casting.Cast curve when adopting common covering slag to pour into a mould medium and high carbon steel; wide hot-fluid of casting process crystallizer progressively descends, and the leptoprosopy hot-fluid rises, along with connecting the increase of watering the stove number; the probability that bonding steel leakage takes place surpasses 30%, is 50% with the further increase bleed-out probability of heat stove number.Use continuous casting covering slag of the present invention; in the liquid steel temperature frequent fluctuation and after constantly absorbing field trash; crystallizer hot-fluid all-the-time stable; can not occur the broadside hot-fluid along with the carrying out of sequence casting descends; the phenomenon that narrow limit hot-fluid rises, continuous casting covering slag of the present invention is suitable for the high pulling rate of sheet blank continuous casting and can keeps stable high crystallizer heat flow density.Stablize mild temperature-viscosity curve owing to adopt this covering slag to have, realized the high pulling rate of 4.0～4.8m/min keeping stable high heat flux (2.30～2.80MW/m at thin-slab caster
2), realize medium high carbon carbon steel and alloy steel continuous casting breakout ratio≤0.3%.
(4) continuous casting covering slag of the present invention is guaranteed good cc billet surface quality, has realized that continuous casting billet product surface lobe rate≤0.1%, limit portion transverse fissure and breach rate are≤0.1%.Covering slag of the present invention is owing to have lower crystallization, softening temperature; in cast during than the medium high carbon carbon steel of low liquidus temperature and steel alloy; in lower crystallization, softening temperature interval, the uneven probability that face crack occurs of strand heat radiation lubricated and that cause because of crystallization of non-newtonian fluid reduces greatly.Reach 2.30～2.80MW/m at the crystallizer hot-fluid
2Interval casting billet surface produce probability≤0.1% of lobe.From the medium and high carbon steel production of having implemented, detecting the lobe rate is zero.
Description of drawings
Fig. 1 is a behavior timesharing cast curve in the embodiment 1 alloy tool steel SKS51 casting process crystallizer;
Fig. 2 is a behavior timesharing cast curve in the embodiment 2 alloy tool steel 8CrV2 casting process crystallizers;
Fig. 3 is a behavior timesharing cast curve in the embodiment 3 structural alloy steel 30CrMo casting process crystallizers;
Fig. 4 is a behavior timesharing cast curve in the embodiment 4 alloy tool steel 75Cr1 casting process crystallizers;
Fig. 5 is a behavior timesharing cast curve in the embodiment 5 alloy tool steel 50CrV4 casting process crystallizers;
Fig. 6 is a behavior timesharing cast curve in the embodiment 6 carbon constructional quality steels 45 steel casting process crystallizers;
Fig. 7 is a behavior timesharing cast curve in the embodiment 7 carbon constructional quality steel 65Mn casting process crystallizers;
Fig. 8 is a behavior timesharing cast curve in the embodiment 8 carbon constructional quality steel SK85 casting process crystallizers;
The common covering slag XCZ-H of Fig. 9 is applied in behavior timesharing cast curve in the medium and high carbon steel casting process crystallizer.
The specific embodiment
Below in conjunction with embodiment, the present invention is further elaborated.
Embodiment 1:
Present embodiment is specifically set forth the situation that continuous casting covering slag that use invents is produced high carbon alloy tool steel SKS51.The SKS51 chemical composition that present embodiment is produced (by weight, %): C 0.81, and Si 0.20, and Mn 0.30, and P 0.15, and S 0.005, Cr:0.30, and Ni:1.5, all the other are Fe and inevitable residual impurity.
The described covering slag constituent of present embodiment (%) is: SiO by weight,
230.0 CaO 29.0, MgO 4.0, Al
2O
34, Fe
2O
30, MnO
21.0, Na
2O 12.0, F9.5, and C 9.8, and all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 0.97, viscosity 1.05 (1300 ℃) pool, 1015 ℃ of melt temperatures, bulk density 0.7Kg/L.
Whole casting process is stable, and no bonding steel leakage phenomenon takes place; Stable 4.0～the 4.5m/min that is controlled at of pulling rate; Coiled sheet detects that the lobe rate is 0, limit portion transverse fissure and breach rate are 0.Behavior timesharing cast curve is seen accompanying drawing 1 in the present embodiment casting process crystallizer.
At its chemical composition of high carbon alloy tool steel SKS51 is C 0.75～0.85, Si≤0.30, and Mn≤0.50, P≤0.030, S≤0.030, Cr:0.20～0.50, Ni:1.3～2.0, all the other are Fe and inevitable residual impurity.For the covering slag constituent (by weight, %) be: SiO
226.0～31, CaO 26.0～29, MgO 4.0～6.0, Al
2O
33.0～4.5, Fe
2O
3≤ 1.3, MnO
2≤ 1.0, Na
2O 11.0～13, F9～10, and C 9.5～10, can also include K
2O≤1.5wt%, LiO
2Among≤the 1.0wt% one or both, all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 0.97 ± 0.05, viscosity 1.05 ± 0.3 (1300 ℃) pool, 1015 ± 20 ℃ of melt temperatures, bulk density 0.7 ± 0.1Kg/L.Its stable production process does not all have the bonding steel leakage phenomenon and takes place, and slab quality is good, and concrete data are omitted.
Embodiment 2:
Present embodiment is set forth the situation of using the continuous casting covering slag production high carbon alloy tool steel 8CrV2 that is invented.(by weight, %): C 0.84, and Si 0.38, and Mn 0.55, and P 0.020, and S 0.005, and Cr 0.50, and V 0.18, and all the other are Fe and unavoidable impurities for the chemical composition of described 8CrV2 molten steel.
The described covering slag constituent of present embodiment (%) is: SiO by weight,
229.0 CaO 24.0, MgO 6.0, Al
2O
34.5, Fe
2O
31.2, MnO
20.5, Na
2O 13.0, and F 12, and C 7.1, LiO
20.8 all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 0.83, viscosity 0.95 (1300 ℃) pool, 968 ℃ of melt temperatures, bulk density 0.65Kg/L.
Whole casting process is stable, and no bonding steel leakage phenomenon takes place; Stable 4.0～the 4.3m/min that is controlled at of pulling rate; Coiled sheet detects that the lobe rate is 0, limit portion transverse fissure and breach rate are 0.Behavior timesharing cast curve is seen accompanying drawing 2 in the present embodiment casting process crystallizer.
(by weight, %): C 0.75～0.85, and Si 0.20～0.40 at the chemical composition of high carbon alloy tool steel 8CrV2 molten steel, Mn 0.30～0.60, P≤0.025, S≤0.025, Cr 0.40～0.70, and V 0.15～0.25, and all the other are Fe and unavoidable impurities.For the covering slag constituent (by weight, %) be: SiO
226.0～30, CaO 23.0～26.0, MgO 5.0～6.0, Al
2O
33.5～4.5, Fe
2O
3≤ 1.3, MnO
2≤ 1.0, Na
2O 11.0～13.0, and F 11～12, and C 7.0～9.0, can also include K
2O≤1.5wt%, LiO
2Among≤the 1.0wt% one or both, all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 0.82～0.92, viscosity 0.95 ± 0.3 (1300 ℃) pool, 968 ± 20 ℃ of melt temperatures, bulk density 0.65 ± 0.1Kg/L.Its stable production process does not all have the bonding steel leakage phenomenon and takes place, and slab quality is good, and concrete data are omitted.
Embodiment 3:
Present embodiment is specifically set forth the situation that continuous casting covering slag that use invents is produced structural alloy steel 30CrMo.(by weight, %): C 0.26, and Si 0.30, and Mn 0.60, and P 0.015, and S 0.003, and Cr 0.950, and Mo 0.19, and all the other are Fe and inevitable residual impurity for the 30CrMo chemical composition of described production.
The described covering slag constituent of present embodiment (%) is: SiO by weight,
224.0 CaO 24.5, MgO 6.0, Al
2O
34.5, Fe
2O
31.3, MnO
21.0, Na
2O 13.0, and F 12, and C 9.5, K
2O 1.5, and all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 1.02, viscosity 0.90 (1300 ℃) pool, 958 ℃ of melt temperatures, bulk density 0.6Kg/L.
Whole casting process is stable, and no bonding steel leakage phenomenon takes place; Stable 4.0～the 4.3m/min that is controlled at of pulling rate; Coiled sheet detects that the lobe rate is 0, limit portion transverse fissure and breach rate are 0.Behavior timesharing cast curve is seen accompanying drawing 3 in the present embodiment casting process crystallizer.
(by weight, %): C 0.26～0.34, and Si 0.17～0.37 at high carbon alloy tool steel 30CrMo chemical composition, Mn 0.40～0.70, P≤0.035, S≤0.035, Cr 0.80～1.10, and Mo 0.15～0.25, and all the other are Fe and inevitable residual impurity.Preferred covering slag constituent (%) is: SiO by weight,
223.0～26, CaO 23.0～27.0, MgO5.0～6.0, Al
2O
33.5～4.5, Fe
2O
3≤ 1.3, MnO
2≤ 1.0, Na
2O 12.0～13.0, and F 11～12, and C 9.0～10.0, can also include K
2O≤1.5wt%, LiO
2Among≤the 1.0wt% one or both, all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 0.92～1.02, viscosity 0.90 ± 0.3 (1300 ℃) pool, 947～978 ℃ of melt temperatures, bulk density 0.6 ± 0.1Kg/L.Its stable production process does not all have the bonding steel leakage phenomenon and takes place, and slab quality is good, and concrete data are omitted.
Embodiment 4:
Present embodiment is specifically set forth the situation that continuous casting covering slag that use invents is produced high carbon alloy tool steel 75Cr1.(by weight, %) C 0.74, and Si 0.35, and Mn 0.80, and P 0.015, and S 0.004, and Cr 0.40, and V 0.03, and all the other are Fe and unavoidable impurities for the chemical composition of described 75Cr1 molten steel.
The described covering slag constituent of present embodiment (%) is: SiO by weight,
228.0 CaO 27.5, MgO 4.0, Al
2O
33.0, Fe
2O
31.0, MnO
20.8, Na
2O 11.0, and F 11, and C 9.9, K
2O 1.2, LiO
20.9 all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 0.98, viscosity 0.97 (1300 ℃) pool, 998 ℃ of melt temperatures, bulk density 0.7Kg/L.
Whole casting process is stable, and no bonding steel leakage phenomenon takes place; Stable 4.0～the 4.7m/min that is controlled at of pulling rate; Coiled sheet detects that the lobe rate is 0, limit portion transverse fissure and breach rate are 0.Behavior timesharing cast curve is seen accompanying drawing 4 in the present embodiment casting process crystallizer.
(by weight, %) C 0.70～0.80, and Si 0.20～0.45 at the chemical composition of high carbon alloy tool steel 75Cr1 molten steel, Mn 0.60～0.90, P≤0.025, S≤0.025, Cr 0.30～0.60, and V 0.02～0.08, and all the other are Fe and unavoidable impurities.Preferred covering slag constituent (%) is: SiO by weight,
225.0～28.0, CaO 25.0～28, MgO 4.0～5.0, Al
2O
32.5～3.5, Fe
2O
3≤ 1.3, MnO
2≤ 1.0, Na
2O 10.0～12.0, and F 9～11, and C 8.5～10.0, can also include K
2O≤1.5wt%, LiO
2Among≤the 1.0wt% one or both, all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 0.92～1.02, viscosity 0.97 ± 0.3 (1300 ℃) pool, 998 ± 20 ℃ of melt temperatures, bulk density 0.7 ± 0.1Kg/L.Its stable production process does not all have the bonding steel leakage phenomenon and takes place, and slab quality is good, and concrete data are omitted.
Embodiment 5:
Present embodiment is specifically set forth the situation that continuous casting covering slag that use invents is produced high carbon alloy tool steel 50CrV4.This 50CrV4 chemical composition of producing (by weight, %): C 0.50, and Si 0.20, and Mn 1.00, and P 0.015, and S 0.005, Cr1.00, and V 0.15, and all the other are Fe and inevitable residual impurity.
The described covering slag constituent of present embodiment (%) is: SiO by weight,
227.0 CaO 26.0, MgO 6.0, Al
2O
32.5, Fe
2O
30.9, MnO
20.1, Na
2O 13.0, and F 11.5, and C 9.0, K
2O 1.1, LiO
20.6 all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 0.96, viscosity 0.90 (1300 ℃) pool, 978 ℃ of melt temperatures, bulk density 0.6Kg/L.
Whole casting process is stable, and no bonding steel leakage phenomenon takes place; Stable 4.0～the 4.7m/min that is controlled at of pulling rate; Coiled sheet detects that the lobe rate is 0, limit portion transverse fissure and breach rate are 0.Behavior timesharing cast curve is seen accompanying drawing 5 in the present embodiment casting process crystallizer.
At high carbon alloy tool steel 50CrV4 chemical composition (by weight, %): C 0.47～0.55, Si≤0.40, Mn 0.70～1.10, P≤0.025, S≤0.025, Cr 0.90～1.20, V 0.10～0.25, all the other are Fe and inevitable residual impurity.Preferred covering slag constituent (%) is: SiO by weight,
224.0～28.0, CaO 23.0～27, MgO 5.0～6.0, Al
2O
32.5～3.5, Fe
2O
3≤ 1.3, MnO
2≤ 1.0, Na
2O 11.0～13.0, and F 11～12, and C 9～10.0, can also include K
2O≤1.5wt%, LiO
2Among≤the 1.0wt% one or both, all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 0.92～1.02, viscosity 0.90 ± 0.3 (1300 ℃) pool, 978 ± 20 ℃ of melt temperatures, bulk density 0.6 ± 0.1Kg/L.Its stable production process does not all have the bonding steel leakage phenomenon and takes place, and slab quality is good, and concrete data are omitted.
Embodiment 6:
Present embodiment is specifically set forth the situation that continuous casting covering slag that use invents is produced carbon constructional quality steel 45 steel.The chemical composition of 45 molten steel of being produced (by weight, %): C 0.45, and Si 0.25, and Mn 0.60, and P 0.016, and S 0.005, and Cr 0.05, Ni0.04, and Cu0.15, Ti 0.020, and all the other are Fe and unavoidable impurities.
The described covering slag constituent of present embodiment (%) is: SiO by weight,
227.0 CaO 25.0, MgO 5.0～6.0, Al
2O
34.5, Fe
2O
31.0, MnO
20.6, Na
2O 13.0, and F 11, and C 7.5, K
2O 1.5, LiO
20.7 all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 0.93, viscosity 0.92 (1300 ℃) pool, 988 ℃ of melt temperatures, bulk density 0.6Kg/L.
Whole casting process is stable, and no bonding steel leakage phenomenon takes place; Stable 4.0～the 4.8m/min that is controlled at of pulling rate; Coiled sheet detects that the lobe rate is 0, limit portion transverse fissure and breach rate are 0.Behavior timesharing cast curve is seen accompanying drawing 6 in the present embodiment casting process crystallizer.
(by weight, %): C 0.42～0.50, and Si 0.17～0.37, and Mn 0.50～0.80 at the chemical composition of carbon constructional quality steel 45 molten steel, P≤0.025, S≤0.025, Cr≤0.25, Ni≤0.30, Cu≤0.25, all the other are Fe and unavoidable impurities for Ti 0.015～0.025.Preferred covering slag constituent (%) is: SiO by weight,
224.0～28.0, CaO 23.0～27.0, MgO 5.0～6.0, Al
2O
33.5～4.5, Fe
2O
3≤ 1.3, MnO
2≤ 1.0, Na
2O 12.0～13.0, and F 10.0～12.0, and C 7.0～9.0, can also include K
2O≤1.5wt%, LiO
2Among≤the 1.0wt% one or both, all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 0.88～0.97, viscosity 0.92 ± 0.3 (1300 ℃) pool, 988 ± 20 ℃ of melt temperatures, bulk density 0.6 ± 0.1Kg/L.Its stable production process does not all have the bonding steel leakage phenomenon and takes place, and slab quality is good, and concrete data are omitted.
Embodiment 7:
Present embodiment is specifically set forth the situation that continuous casting covering slag that use invents is produced carbon constructional quality steel 65Mn.This time (by weight, %): C 0.65, and Si 0.27, and Mn 1.10, and P 0.015, and S 0.004, and Cr 0.035, and Ni 0.04, and Cu 0.12, and Ti 0.021, and all the other are Fe and unavoidable impurities for the chemical composition of the 65Mn molten steel of producing.
The described covering slag constituent of present embodiment (%) is: SiO by weight,
226.0 CaO 25.0, MgO 5.8, Al
2O
34.4, Fe
2O
31.2, MnO
20.7, Na
2O 10.5, and F 12, and C 9.3, K
2O 1.3, LiO
20.8 all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 0.96, viscosity 0.95 (1300 ℃) pool, 980 ℃ of melt temperatures, bulk density 0.6Kg/L.
Whole casting process is stable, and no bonding steel leakage phenomenon takes place; Stable 4.0～the 4.8m/min that is controlled at of pulling rate; Coiled sheet detects that the lobe rate is 0, limit portion transverse fissure and breach rate are 0.Behavior timesharing cast curve is seen accompanying drawing 7 in the present embodiment casting process crystallizer.
At the chemical composition of carbon constructional quality steel 65Mn molten steel (by weight, %): C 0.62～0.70, Si 0.17～0.37, and Mn 0.90～1.20, P≤0.025, S≤0.025, Cr≤0.25, Ni≤0.30, Cu≤0.25, Ti 0.015～0.025, and all the other are Fe and unavoidable impurities.Preferred covering slag constituent (%) is: SiO by weight,
224.0～28.0, CaO 23.0～27.0, MgO 5.0～6.0, Al
2O
33.5～4.5, Fe
2O
3≤ 1.3, MnO
2≤ 1.0, Na
2O 10.0～11.5, F10.0～12.0, and C 9.0～10.0, can also include K
2O≤1.5wt%, LiO
2Among≤the 1.0wt% one or both, all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 0.90～1.0, viscosity 0.95 ± 0.3 (1300 ℃) pool, 980 ± 20 ℃ of melt temperatures, bulk density 0.6 ± 0.1Kg/L.Its stable production process does not all have the bonding steel leakage phenomenon and takes place, and slab quality is good, and concrete data are omitted.
Embodiment 8:
Present embodiment is specifically set forth the situation that continuous casting covering slag that use invents is produced high-carbon steel SK85.The chemical composition of the SK85 molten steel that this is produced (by weight, %): C 0.88, and Si 0.25, and Mn 0.30, and P 0.020, and S 0.006, and Cr 0.045, Ni0.05, and Cu 0.15, and Ti 0.024, and all the other are Fe and unavoidable impurities.
The described covering slag constituent of present embodiment (%) is: SiO by weight,
228.0 CaO 24.5, MgO 5.5, Al
2O
34.0, Fe
2O
31.1, MnO
20.7, Na
2O 11.0, and F 12, and C 9.0, K
2O 1.2, LiO
20.9 all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 0.875, viscosity 0.88 (1300 ℃) pool, 978 ℃ of melt temperatures, bulk density 0.6Kg/L.
Whole casting process is stable, and no bonding steel leakage phenomenon takes place; Stable 4.0～the 4.8m/min that is controlled at of pulling rate; Coiled sheet detects that the lobe rate is 0, limit portion transverse fissure and breach rate are 0.Behavior timesharing cast curve is seen accompanying drawing 8 in the present embodiment casting process crystallizer.
At the chemical composition of carbon constructional quality steel SK85 molten steel (by weight, %): C 0.80～0.90, Si 0.10～0.35, and Mn 0.10～0.50, P≤0.030, S≤0.030, Cr≤0.30, Ni≤0.25, Cu≤0.25, Ti 0.015～0.025, and all the other are Fe and unavoidable impurities.Preferred covering slag constituent (%) is: SiO by weight,
224.0～28.0, CaO 23.0～27.0, MgO 5.0～6.0, Al
2O
33.5～4.5, Fe
2O
3≤ 1.3, MnO
2≤ 1.0, Na
2O 10.0～12.0, F11～12, and C 8.0～10.0, can also include K
2O≤1.5wt%, LiO
2Among≤the 1.0wt% one or both, all the other are water and/or unavoidable impurities.The physical and chemical index of described covering slag is basicity 0.87～0.97, viscosity 0.88 ± 0.3 (1300 ℃) pool, 978 ± 20 ℃ of melt temperatures, bulk density 0.6 ± 0.1Kg/L.Its stable production process does not all have the bonding steel leakage phenomenon and takes place, and slab quality is good, and concrete data are omitted.
Embodiment 9:
Present embodiment is specifically set forth the situation of using common covering slag XCZ-H (manufacturer Henan Province Xibao Smelting Material Group Co.,Ltd) to produce carbon constructional quality steel 45 steel.The chemical composition of carbon constructional quality steel 45 molten steel (by weight, %): C0.42～0.50, Si 0.17～0.37, and Mn 0.50～0.80, P≤0.025, S≤0.025, Cr≤0.25, Ni≤0.30, Cu≤0.25, all the other are Fe and unavoidable impurities for Ti 0.015～0.025.
Cast curve when adopting common covering slag to pour into a mould carbon constructional quality steel 45 steel; referring to Fig. 9; wide hot-fluid of casting process crystallizer progressively descends; the leptoprosopy hot-fluid rises; along with connecting the increase of watering the stove number; the probability that bonding steel leakage takes place surpasses 30%, is 50% with the further increase bleed-out probability of heat stove number.Use continuous casting covering slag of the present invention; in the liquid steel temperature frequent fluctuation and after constantly absorbing field trash; crystallizer hot-fluid all-the-time stable; referring to Fig. 1～8; can not occur the broadside hot-fluid along with the carrying out of sequence casting descends; the phenomenon that narrow limit hot-fluid rises, continuous casting covering slag of the present invention is suitable for the high pulling rate of sheet blank continuous casting and can keeps stable high crystallizer heat flow density.
With above-listed detailed description is illustrating at production example of the present invention, but this embodiment is not in order to limit claim of the present invention, all the technology of the present invention that do not break away from are used spirit and equivalence enforcement or change of doing in kind, all should be contained in the application's the claim.
Claims (6)
1. the continuous casting covering slag of medium high carbon carbon steel and steel alloy is characterized in that, mainly is grouped into by following one-tenth: SiO
223.0～31.0wt%, CaO22.0～29.0wt%, MgO4.0～6.0wt%, Al
2O
32.5～4.5wt%, Fe
2O
3≤ 1.3wt%, MnO
2≤ 1.0wt%, Na
2O10.0～13.0wt%, F8.7～12.0wt%, C7.0～10.0wt%.
2. the continuous casting covering slag of medium high carbon carbon steel as claimed in claim 1 and steel alloy is characterized in that, also includes K
2O≤1.5wt%, LiO
2Among≤the 1.0wt% one or both.
3. the continuous casting covering slag of medium high carbon carbon steel as claimed in claim 1 or 2 and steel alloy is characterized in that, the physical and chemical index of described covering slag: fusion point is 997 ± 50 ℃; basicity is 0.92 ± 0.1; when viscosity is 1300 ℃, 0.95 ± 0.5 pool, bulk density is 0.60 ± 0.2Kg/L.
4. the continuous casting covering slag of medium high carbon carbon steel as claimed in claim 1 and steel alloy is characterized in that, mainly is grouped into by following one-tenth: SiO
223～28wt%, CaO24.0～27.0wt%, MgO4.0～6.0wt%, Al
2O
32.5～4.5wt%, Fe
2O
3≤ 1.3wt%, MnO
2≤ 1.0wt%, Na
2O11.0～13.0wt%, F10.0～12.0wt%, C7.0～10.0wt%.
5. the continuous casting covering slag of medium high carbon carbon steel as claimed in claim 4 and steel alloy is characterized in that, described fusion point is 987 ± 40 ℃, and basicity is 0.92 ± 0.05.
6. the continuous casting covering slag of medium high carbon carbon steel as claimed in claim 1 and steel alloy is characterized in that, the C content of described medium high carbon carbon steel is that 0.26～1.0wt%, Mn content are 0.35～1.2wt%; The C of described medium high carbon steel alloy is 0.26～1.0Wt.%.
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